CNN

Track the candidates as they crisscross the country.

(CNN) – Battleground states Ohio and Pennsylvania dominate the candidates' schedules Friday.

Republican presidential nominee John McCain, on the second day of his bus tour through Ohio, holds rallies in Hanoverton, Steubenville, New Philadelphia and Columbus.

Meanwhile, McCain's running mate, Alaska Gov. Sarah Palin, is scheduled to visit Pennsylvania, meeting voters in Latrobe and York.

Sen. Joe Biden, the Democratic vice presidential nominee, begins the day with a rally in Delaware, his home state. He's then expected to travel to Ohio for rallies in Kettering and Lima.

Ohio, with its 20 electoral votes, and Pennsylvania, which carries 21 electoral votes, have been two of the most visited states during the General Election period by the presidential tickets. The presidential and vice-presidential candidates have to each state more than 40 times, according to a CNN count of campaign visits since June 8.

See a map of campaign visits

The most recent CNN Poll of Polls in Ohio showed Democratic presidential nominee Barack Obama with an 8-point lead over McCain, 50 percent to 42 percent. The polls were conducted October 22 through October 27.

Obama holds a considerable lead in Pennsylvania as well. The most recent CNN Poll of Polls in the state - released Thursday - showed Obama leading McCain by 11 points, 53 percent to 42 percent. The polls were conducted October 23 through October 28.

See the most recent state and national polls

Obama, meanwhile, plans to hold a rally in Des Moines, Iowa and then heads to an event in Highland, Indiana.

In Iowa, he leads McCain by 12 points - 52 percent to 40 percent - in the most recent CNN Poll of Polls in the state. The polls were conducted October 19 through October 24.

The race in Indiana is much closer, according to recent polls. McCain leads Obama by 1 point, 47 percent to 46 percent, in a CNN Poll of Polls in Indiana. The poll of polls was released on Thursday. The polls were conducted October 23 through 28.